No, it is a constant 1.33:1. Snyder shot on 35mm film with the idea that IMAX locations would be able to play the full height, and that conventional theaters would show it at 1.85:1. When HBO Max gave him the chance to finish his version, he decided to do so using the full height of the image...
BTW, This style of presentation was used for the IMAX sequences on The Dark Knight trilogy bonus disc. I personally don’t have an issue with it. There is no ideal way to present 2.35/1.43 shifts at home in a 16x9 standard - you can either crop 1.43 so it’s not OAR, or you get black bars that...
Snyder stated in reference to similarly formatted Justice League footage that that’s how he saw it when he shot it and edited it and that’s the look he prefers.
2.35:1 is for the bulk of the film, which was shot on conventional 35mm. 1.43:1 is for the IMAX sequences which were shot on IMAX 15/70 film. This is an OAR presentation.